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how is heat lost in animals?

This is a complex question. Too general to tell you the truth. However, most lower chordates lose heat through their skin by having blood close to the surface. Blood picks up heat throughout the body. Mammals have a problem with their hair insulating the skin so many have to use their breathing or mouth to expel heat for the most part. Humans use their skin, mouth and sweat glands to help rid of heat.

Steve Sample

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